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7 February 2007 Highly efficient and reliable 1 kW QCW laser stacks with diffraction limited fast axis beam collimation
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808 nm, QCW laser bars delivering peak power higher than 150 Watts were developed. The optimization of the tensile strain in the QW structure, the design configuration of the laser cavity together with an improved packaging technology lead to more than 55% wall plug efficiency when assembled as stacks. Due to the high characteristic temperature (T0, T1) values and high efficiency, the output power of these devices is almost insensitive to elevated heat sink temperatures. In addition, a collimation technique which significantly improves the beam quality of the laser stacks was developed. The active collimation method is flexible and control over the level of collimation is achievable. The use of this collimation technique alongside with high quality micro lenses allows for a reduction of the fast axis divergence to values as low as 3 mrad with minimal power losses. An automatic process control was developed allowing for the efficient attachment of the collimating micro lenses in a highly reproducible fashion. The combination of the collimation technique with a reliable mounting and stacking technology supports the serial manufacturing of devices delivering 1 kW peak power in QCW operation. These QCW collimated diode laser stacks demonstrate stable operation and high reliability in the course of more than 6*108shots at 2% duty cycle. Another important advantage of the collimated stacks is their capability to withstand severe environmental conditions, maintaining high beam quality and performance.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nir Feldman, Yoram Karni, Yuri Berk, Yaakov Gridish, Genadi Klumel, Moshe Levy, and Shlomo Risemberg "Highly efficient and reliable 1 kW QCW laser stacks with diffraction limited fast axis beam collimation", Proc. SPIE 6456, High-Power Diode Laser Technology and Applications V, 64561C (7 February 2007);


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